Box:Init(Name,R,C,Rs,Cs,Clr,Shadow): public: return true
  Instvar object variables are initialised by recieved parameters.

  Parameter description
  ~~~~~~~~~~~~~~~~~~~~~
  Name: string: default is "", i.e. no title.
   Window title.

  R: numeric: default is 3.
   Upper window border.

  C: numeric: default is 4.
   Left window border.

  Rs: numeric: default is MaxRow()-7.
   Window height in number of lines which fit the window.

  Cs: numeric: default is MaxCol()-9.
   Window width in number of rows which fit the window.

  Clr: character: default is m->Color:Edit.
   Window colors.

  Shadow: logical: default is true for color monitor, false for monochrom.
   If true the shadow wil be painted.